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当前位置: 首页 > 文章 > 青菜-萝卜轮作条件下镉对土壤微生物活性和磷脂脂肪酸特性的影响 浙江大学学报(农业与生命科学版) 2009,35 (5) 569-577
Position: Home > Articles > Effects of cadmium on soil microbial activities and phospholipid fatty acids in pakchoi-radish rotation system Journal of Zhejiang University (Agriculture and Life Sciences) 2009,35 (5) 569-577

青菜-萝卜轮作条件下镉对土壤微生物活性和磷脂脂肪酸特性的影响

作  者：
申屠佳丽;何振立;杨肖娥;李廷强
单  位：
浙江大学
关键词：
镉;磷脂脂肪酸;微生物生物量;土壤基础呼吸;轮作
摘  要：
通过盆栽试验研究青菜-萝卜轮作条件下2种不同类型人为镉污染土(红黄壤和小粉土)中不同处理对土壤微生物活性及磷脂脂肪酸(PLFAs)特性的影响.结果表明:蔬菜轮作条件下,2种土壤外源镉含量<1.00 mg·kg-1时,土壤微生物生物量碳增加,土壤基础呼吸作用略有减弱;随着外加镉浓度的增加,微生物生物量碳呈下降趋势,呼吸作用加强.种植萝卜后红黄壤微生物生物量碳含量降低,小粉土微生物生物量碳增加;2种土壤的基础呼吸速率均降低.不同蔬菜轮作对镉-微生物活性之间互动关系的影响不大.对磷脂脂肪酸图谱的分析结果表明,土壤微生物群落对镉胁迫较为敏感.真菌、革兰氏阳性菌以及灌木菌根真菌(AMF)随土壤镉含量的增加而增加,细菌、革兰氏阴性菌、放线菌则随土壤镉含量的增加而下降.真菌对镉胁迫的耐性最好,放线菌对镉胁迫最敏感.不同土壤类型、根际非根际土壤的PLFA剖面存在较大差异.根际土壤微生物受镉胁迫相对较小,群落结构较为稳定.对PLFAs的主成分分析结果表明,种植萝卜后土壤微生物群落结构更趋稳定.
译  名：
Effects of cadmium on soil microbial activities and phospholipid fatty acids in pakchoi-radish rotation system
作  者：
SHENTU Jia-li1,2,HE Zhen-li1,3,YANG Xiao-e1,LI Ting-qiang1(1.Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health,College of Environmental and Resource Sciences,Zhejiang University,Hangzhou 310029,China;2.College of Environmental Science and Engineering,Zhejiang Gongshang University,Hangzhou 310012,China;3.Institute of Food and Agricultural Sciences,Indian River Research and Education Center,University of Florida,Fort Pierce,Florida 34945,USA)
关键词：
cadmium;phospholipid fatty acids;microbial biomass;soil basal respiration;rotation
摘  要：
Greenhouse experiments were conducted in two different soils to study the effects of cadmium(Cd) on soil microbial activities and phospholipid fatty acids(PLFAs) in pakchoi-radish rotation system.The results show that in pakchoi-radish rotation system,soil microbial biomass was enhanced at low Cd levels(<1.00 mg·kg-1),but was inhibited consistently with increasing Cd concentrations;soil basal respiration was restrained at low Cd loading(<1.00 mg·kg-1),and was enhanced at higher Cd levels.Microbial biomass in pakchoi-growing red yellowish soil(RYS) were higher than those in radish-growing RYS,which was different from sand loamy soil(SLS).The values of basal respiration rate in pakchoi-growing soil were higher than those in radish-growing soils.It was revealed that the correlation between microbial activity and Cd loading was affected by pakchoi-radish rotation system.The results also show that PLFAs in soil microbe was sensitive with increasing Cd concentrations.The relative content of general PLFAs in fungi,Gram-positive bacteria or arbuscular mycorrhizal fungi(AMF) was all positively correlated with Cd concentration in the soil,while that in bacteria,actinomycetes or Gram-negative bacteria was all negatively correlated with Cd concentration in the soil.Fungus was more resistant to Cd stress than bacteria or actinomycete,and actinomycete was most sensitive to Cd stress.PLFAs profiles differed between RYS and SLS soil,and between the rhizosphere and nonrhizosphere environment.Microbial community in rhizospheric soil suffered less Cd stress,and was more stable.The results of principal component analysis(PCA) also indicated that microbial community tended to be more stable and adapted to Cd stress after radish planted.

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